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My challenger came with 18's. I love the smooth ride but can't stand the grey wheels. Found a deal on brand new black 20's. I'm worried about gas mileage and ride quality going down. Any thoughts or input? Thanks
If the diameters are close, it won't change you ratio or speedometer much.I'm making the 18''-20'' upgrade as well, will it effect the gear ratio of my rear end? It came with a 3.73.
I was running Goodyear Assurance Comfortred tires at 235/55R18. They list 744 revs per mile. So maybe that is why I saw a difference when I swapped to 245/45R20 at 729 revs per mile.The stock 20" tires are listed at 729 revs per mile.
The stock 18" tires are listed at 731 revs per mile.
This is virtually undetectable by the vehicle ECU. There will be no difference in effective gear ratio, speedo readings, etc. by going from 18s to 20s.
What you will get is more weight. The 20" stock tires are about 1-2 lbs. heavier and the wheels are 3-6 lbs. heavier depending upon model so you're adding several lbs. of unsprung weight which hurts performance. You're also adding friction with the wider contact patch which helps acceleration but hurts fuel economy. And I don't see how you could possibly not lose ride quality. Anybody knows that less sidewall equals a stiffer ride. Period.
So my opinion is if you want performance, power, fuel economy, and ride quality...go with 18s. If you want the best looking setup...go with 20s.
Normally I'd agree with you. 18s have clear advantages over 20s in many ways except one key area: Summer performance tire selection, such as Michelin Pilot Super sport and Pirelli P-Zero etc. You just can't find these kinds of tires in higher profile sizes that will fit our Challengers. A 20 inch wheel allows you to have a low-profile performance tire that is still tall enough to properly fill the wheelwell.So my opinion is if you want performance, power, fuel economy, and ride quality...go with 18s. If you want the best looking setup...go with 20s.
Yeah probably. I was just going by the factory tires in each size. People tend to think that 20s automatically equals bigger but it doesn't. The overall diameter is virtually the same.I was running Goodyear Assurance Comfortred tires at 235/55R18. They list 744 revs per mile. So maybe that is why I saw a difference when I swapped to 245/45R20 at 729 revs per mile.